Twitch client installed classic/retail version on retail/classic

Describe the bug

1x ...faceDBM-CastleNathria\StoneborneGenerals.lua:593: attempt to perform arithmetic on field '?' (a nil value)
[string "@DBM-CastleNathria\StoneborneGenerals.lua"]:593: in function `handler'
[string "@DBM-Core\DBM-Core-9.0.15-10-gc676aa3.lua"]:896: in function <DBM-Core\DBM-Core.lua:883>
[string "=(tail call)"]: ?
[string "@DBM-Core\DBM-Core-9.0.15-10-gc676aa3.lua"]:896: in function <DBM-Core\DBM-Core.lua:883>

Locals:
Skipped (In Encounter)

Do you have an error log of what happened?

To Reproduce

Screenshots

Did you try having DeadlyBossMods as the only enabled addon and everything else (especially something like ElvUI) disabled?

Which version of DeadlyBossMods are you using?
latest alpha

Was it working in a previous version? If yes, which was the last good one?
yes

Additional context